Try deleting your preferences - http://www.footballmanager.com/faq/?game=38&id=218
Then delete your cache - http://www.footballmanager.com/faq/?game=38&id=217
Once that's done, reverify your cache and try the game again - http://www.footballmanager.com/faq/?game=38&id=221
Then try changing your rendering mode from GPU to Software as shown here - http://www.footballmanager.com/faq/?game=38&id=246
If that STILL doesn't work, please post your dxdiag and let us know if you have any kind of anti-virus installed, and if so what type. Dxdiag details here - http://www.footballmanager.com/faq/?game=38&id=220
Let me know how you get on, thanks.

It could have been the files, but clearly not based on you deleting everything. This is a new issue to me, unfortunately I'm going to have to escalate to our QA team, who will likely need some more details from you and possibly need you to submit some files. It will mean this won't get picked up until tomorrow, but there should be the right people able to look at it. Apologies I couldn't help get it fixed.

There are lots of options, so just delete FM and reinstall. Hopefully this'll fix the issue, but otherwise we can look at other solutions. There is a small chance that the issue is being caused by the unofficial download file, so we may need you to send that along with your saved game, but let's try this first.

Yes, perform a full uninstall. Details on how to do that here - http://www.footballmanager.com/faq/?game=38&id=219
Make a back-up of your saved game folder before doing this and remember the location so you can just drop that back in afterwards.

These are files have been created unofficially, so may be causing the problem. Did the problem happen prior to downloading these? If not, then delete the unofficial folders and run the game and see if it helps.

Excuse me. We're working on shifts over the holiday period, with today being my first shift, so I'm getting up to speed, but was trying to help.
If it's a known bug and has been reported then we'll be dealing with asap.